package com.ali.Reggie.controller;

import com.ali.Reggie.common.R;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.Mapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * @author ：ALi
 * @date ：Created in 2022/6/10 10:02
 * @description：通用控制类 MultipartFile的参数名要和请求中的name一致
 * @modified By：
 * @version: $
 */
@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    //文件上传
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        //获得上传图片的后缀
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

        //随机生成文件名
        String fileName = UUID.randomUUID().toString()+suffix;

        File dir = new File(basePath);
        if(!dir.exists()){
            dir.mkdirs();
        }

        try {
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }

        return R.success(fileName);
    }

    //文件下载
    @GetMapping("/download")
    public void download(@RequestParam String name, HttpServletResponse response){
        //输入流读取文件内容
        try {
            FileInputStream fileInputStream = new FileInputStream(new File(basePath+name));

            //输出流，将文件写回到浏览器
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("img/jpeg");

            byte[] bytes = new byte[1024];
            int len = 0;
            while((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            outputStream.close();
            fileInputStream.close();

        } catch (Exception e) {
            e.printStackTrace();
        }



    }
}